//
//  Person.h
//  kvo
//
//  Created by YuanJiang on 2019/9/5.
//  Copyright © 2019 llbt. All rights reserved.
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface Battery : NSObject

@property(nonatomic,strong) NSString *batteryNum;

@end


@interface Phone : NSObject

@property(nonatomic,strong) Battery *barrery;

@end

@interface Person : NSObject

@property(nonatomic,strong) Phone *phone;
@property(nonatomic,strong) NSString *name;

@end



NS_ASSUME_NONNULL_END
